Management of delayed cerebral ischemia after subarachnoid hemorrhage

Charles L Francoeur, Stephan A Mayer, Charles L Francoeur, Stephan A Mayer

Abstract

For patients who survive the initial bleeding event of a ruptured brain aneurysm, delayed cerebral ischemia (DCI) is one of the most important causes of mortality and poor neurological outcome. New insights in the last decade have led to an important paradigm shift in the understanding of DCI pathogenesis. Large-vessel cerebral vasospasm has been challenged as the sole causal mechanism; new hypotheses now focus on the early brain injury, microcirculatory dysfunction, impaired autoregulation, and spreading depolarization. Prevention of DCI primarily relies on nimodipine administration and optimization of blood volume and cardiac performance. Neurological monitoring is essential for early DCI detection and intervention. Serial clinical examination combined with intermittent transcranial Doppler ultrasonography and CT angiography (with or without perfusion) is the most commonly used monitoring paradigm, and usually suffices in good grade patients. By contrast, poor grade patients (WFNS grades 4 and 5) require more advanced monitoring because stupor and coma reduce sensitivity to the effects of ischemia. Greater reliance on CT perfusion imaging, continuous electroencephalography, and invasive brain multimodality monitoring are potential strategies to improve situational awareness as it relates to detecting DCI. Pharmacologically-induced hypertension combined with volume is the established first-line therapy for DCI; a good clinical response with reversal of the presenting deficit occurs in 70 % of patients. Medically refractory DCI, defined as failure to respond adequately to these measures, should trigger step-wise escalation of rescue therapy. Level 1 rescue therapy consists of cardiac output optimization, hemoglobin optimization, and endovascular intervention, including angioplasty and intra-arterial vasodilator infusion. In highly refractory cases, level 2 rescue therapies are also considered, none of which have been validated. This review provides an overview of current state-of-the-art care for DCI management.

Keywords: Delayed cerebral ischemia; Multimodality monitoring; Subarachnoid hemorrhage; Vasospasm.

Figures

Fig. 1
Fig. 1
Mean maximal TCD values during SAH days 3–14 in patients who did or did not develop DCI. TCD examinations after the diagnosis of DCI were censored. Histogram shows the number of patients with new onset DCI between SAH days 3 and 14. Nine patients had DCI between days 15 and 29. Number (in parentheses) represents the number of TCD examinations performed for each corresponding SAH day. From reference [33], with permission. DCI delayed cerebral ischemia, mBFV mean blood flow velocity, SAH subarachnoid hemorrhage
Fig. 2
Fig. 2
Stepwise approach to the treatment of active DCI from vasospasm. The order or the intensity of therapy must be adapted to each situation. CI cardiac index, Hb hemoglobin, SBP systolic blood pressure

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Source: PubMed

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